US5630906A - Process for the delignifcation and bleaching of a lignocellulose material - Google Patents
Process for the delignifcation and bleaching of a lignocellulose material Download PDFInfo
- Publication number
- US5630906A US5630906A US08/356,283 US35628395A US5630906A US 5630906 A US5630906 A US 5630906A US 35628395 A US35628395 A US 35628395A US 5630906 A US5630906 A US 5630906A
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- US
- United States
- Prior art keywords
- sub
- process according
- oxidizing agent
- iii
- pulp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000000463 material Substances 0.000 title claims abstract description 24
- 238000004061 bleaching Methods 0.000 title claims abstract description 18
- 230000008569 process Effects 0.000 title claims description 24
- 239000011572 manganese Substances 0.000 claims abstract description 36
- 239000007800 oxidant agent Substances 0.000 claims abstract description 29
- 239000003054 catalyst Substances 0.000 claims abstract description 26
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000003446 ligand Substances 0.000 claims abstract description 20
- -1 organometallic cation Chemical class 0.000 claims abstract description 19
- 150000001768 cations Chemical class 0.000 claims abstract description 12
- 239000007864 aqueous solution Substances 0.000 claims abstract description 11
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 7
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000001301 oxygen Substances 0.000 claims abstract description 5
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 38
- 238000007254 oxidation reaction Methods 0.000 claims description 38
- 230000003647 oxidation Effects 0.000 claims description 35
- 239000000460 chlorine Substances 0.000 claims description 16
- 229920001131 Pulp (paper) Polymers 0.000 claims description 12
- 229920005610 lignin Polymers 0.000 claims description 12
- 125000000217 alkyl group Chemical group 0.000 claims description 11
- 239000002023 wood Substances 0.000 claims description 11
- 239000000243 solution Substances 0.000 claims description 9
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 claims description 8
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 6
- 125000003545 alkoxy group Chemical group 0.000 claims description 6
- 229910052801 chlorine Inorganic materials 0.000 claims description 6
- 229910052736 halogen Inorganic materials 0.000 claims description 6
- 150000002367 halogens Chemical class 0.000 claims description 6
- 239000001257 hydrogen Substances 0.000 claims description 6
- 229910052739 hydrogen Inorganic materials 0.000 claims description 6
- 239000004155 Chlorine dioxide Substances 0.000 claims description 4
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 4
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 claims description 4
- 235000019398 chlorine dioxide Nutrition 0.000 claims description 3
- 239000012634 fragment Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 2
- 125000004429 atom Chemical group 0.000 claims description 2
- 150000002431 hydrogen Chemical class 0.000 claims 2
- MMIPFLVOWGHZQD-UHFFFAOYSA-N manganese(3+) Chemical compound [Mn+3] MMIPFLVOWGHZQD-UHFFFAOYSA-N 0.000 abstract description 9
- 230000001590 oxidative effect Effects 0.000 abstract description 4
- 125000004433 nitrogen atom Chemical group N* 0.000 abstract description 2
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 239000002609 medium Substances 0.000 description 13
- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical compound CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 9
- 229920002678 cellulose Polymers 0.000 description 8
- 239000001913 cellulose Substances 0.000 description 8
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 6
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 6
- WAEMQWOKJMHJLA-UHFFFAOYSA-N Manganese(2+) Chemical compound [Mn+2] WAEMQWOKJMHJLA-UHFFFAOYSA-N 0.000 description 6
- RJTZQPTVNWCDBI-UHFFFAOYSA-N n,n'-bis(pyridin-2-ylmethyl)ethane-1,2-diamine Chemical compound C=1C=CC=NC=1CNCCNCC1=CC=CC=N1 RJTZQPTVNWCDBI-UHFFFAOYSA-N 0.000 description 6
- 239000012429 reaction media Substances 0.000 description 6
- ROFVEXUMMXZLPA-UHFFFAOYSA-N Bipyridyl Chemical compound N1=CC=CC=C1C1=CC=CC=N1 ROFVEXUMMXZLPA-UHFFFAOYSA-N 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 5
- 239000012736 aqueous medium Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 5
- 150000004985 diamines Chemical class 0.000 description 5
- 150000004032 porphyrins Chemical group 0.000 description 5
- 238000003786 synthesis reaction Methods 0.000 description 5
- 238000005406 washing Methods 0.000 description 5
- OEGPRYNGFWGMMV-UHFFFAOYSA-N (3,4-dimethoxyphenyl)methanol Chemical compound COC1=CC=C(CO)C=C1OC OEGPRYNGFWGMMV-UHFFFAOYSA-N 0.000 description 4
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- HEDRZPFGACZZDS-MICDWDOJSA-N Trichloro(2H)methane Chemical compound [2H]C(Cl)(Cl)Cl HEDRZPFGACZZDS-MICDWDOJSA-N 0.000 description 4
- DGEZNRSVGBDHLK-UHFFFAOYSA-N [1,10]phenanthroline Chemical compound C1=CN=C2C3=NC=CC=C3C=CC2=C1 DGEZNRSVGBDHLK-UHFFFAOYSA-N 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 4
- 238000006731 degradation reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 125000003118 aryl group Chemical group 0.000 description 3
- 125000001309 chloro group Chemical group Cl* 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 239000011121 hardwood Substances 0.000 description 3
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 3
- SQQMAOCOWKFBNP-UHFFFAOYSA-L manganese(II) sulfate Chemical compound [Mn+2].[O-]S([O-])(=O)=O SQQMAOCOWKFBNP-UHFFFAOYSA-L 0.000 description 3
- 229910000357 manganese(II) sulfate Inorganic materials 0.000 description 3
- 230000033116 oxidation-reduction process Effects 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- 150000003254 radicals Chemical class 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- KXZQYLBVMZGIKC-UHFFFAOYSA-N 1-pyridin-2-yl-n-(pyridin-2-ylmethyl)methanamine Chemical compound C=1C=CC=NC=1CNCC1=CC=CC=N1 KXZQYLBVMZGIKC-UHFFFAOYSA-N 0.000 description 2
- WOXFMYVTSLAQMO-UHFFFAOYSA-N 2-Pyridinemethanamine Chemical compound NCC1=CC=CC=N1 WOXFMYVTSLAQMO-UHFFFAOYSA-N 0.000 description 2
- 108090000790 Enzymes Proteins 0.000 description 2
- 102000004190 Enzymes Human genes 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 229910019093 NaOCl Inorganic materials 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- JQRLYSGCPHSLJI-UHFFFAOYSA-N [Fe].N1C(C=C2N=C(C=C3NC(=C4)C=C3)C=C2)=CC=C1C=C1C=CC4=N1 Chemical compound [Fe].N1C(C=C2N=C(C=C3NC(=C4)C=C3)C=C2)=CC=C1C=C1C=CC4=N1 JQRLYSGCPHSLJI-UHFFFAOYSA-N 0.000 description 2
- 230000003592 biomimetic effect Effects 0.000 description 2
- 239000007844 bleaching agent Substances 0.000 description 2
- 229910001914 chlorine tetroxide Inorganic materials 0.000 description 2
- HGCIXCUEYOPUTN-UHFFFAOYSA-N cyclohexene Chemical compound C1CCC=CC1 HGCIXCUEYOPUTN-UHFFFAOYSA-N 0.000 description 2
- XPPKVPWEQAFLFU-UHFFFAOYSA-J diphosphate(4-) Chemical compound [O-]P([O-])(=O)OP([O-])([O-])=O XPPKVPWEQAFLFU-UHFFFAOYSA-J 0.000 description 2
- 235000011180 diphosphates Nutrition 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- BTIJJDXEELBZFS-QDUVMHSLSA-K hemin Chemical compound CC1=C(CCC(O)=O)C(C=C2C(CCC(O)=O)=C(C)\C(N2[Fe](Cl)N23)=C\4)=N\C1=C/C2=C(C)C(C=C)=C3\C=C/1C(C)=C(C=C)C/4=N\1 BTIJJDXEELBZFS-QDUVMHSLSA-K 0.000 description 2
- 229940025294 hemin Drugs 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000002655 kraft paper Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000000123 paper Substances 0.000 description 2
- VLTRZXGMWDSKGL-UHFFFAOYSA-M perchlorate Chemical compound [O-]Cl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-M 0.000 description 2
- 150000002978 peroxides Chemical class 0.000 description 2
- 125000000864 peroxy group Chemical group O(O*)* 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 239000012286 potassium permanganate Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 2
- 239000011122 softwood Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- KDYFGRWQOYBRFD-UHFFFAOYSA-N succinic acid Chemical compound OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 239000004753 textile Substances 0.000 description 2
- WJUFSDZVCOTFON-UHFFFAOYSA-N veratraldehyde Chemical compound COC1=CC=C(C=O)C=C1OC WJUFSDZVCOTFON-UHFFFAOYSA-N 0.000 description 2
- VOLGAXAGEUPBDM-UHFFFAOYSA-N $l^{1}-oxidanylethane Chemical compound CC[O] VOLGAXAGEUPBDM-UHFFFAOYSA-N 0.000 description 1
- VGUWFGWZSVLROP-UHFFFAOYSA-N 1-pyridin-2-yl-n,n-bis(pyridin-2-ylmethyl)methanamine Chemical compound C=1C=CC=NC=1CN(CC=1N=CC=CC=1)CC1=CC=CC=N1 VGUWFGWZSVLROP-UHFFFAOYSA-N 0.000 description 1
- NJWIMFZLESWFIM-UHFFFAOYSA-N 2-(chloromethyl)pyridine Chemical class ClCC1=CC=CC=N1 NJWIMFZLESWFIM-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 241000221198 Basidiomycota Species 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N DMSO Substances CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 1
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 1
- 108010024636 Glutathione Proteins 0.000 description 1
- GVGLGOZIDCSQPN-PVHGPHFFSA-N Heroin Chemical compound O([C@H]1[C@H](C=C[C@H]23)OC(C)=O)C4=C5[C@@]12CCN(C)[C@@H]3CC5=CC=C4OC(C)=O GVGLGOZIDCSQPN-PVHGPHFFSA-N 0.000 description 1
- 241001484259 Lacuna Species 0.000 description 1
- 229910021380 Manganese Chloride Inorganic materials 0.000 description 1
- GLFNIEUTAYBVOC-UHFFFAOYSA-L Manganese chloride Chemical compound Cl[Mn]Cl GLFNIEUTAYBVOC-UHFFFAOYSA-L 0.000 description 1
- 108010059896 Manganese peroxidase Proteins 0.000 description 1
- 108700020962 Peroxidase Proteins 0.000 description 1
- 102000003992 Peroxidases Human genes 0.000 description 1
- 241000222385 Phanerochaete Species 0.000 description 1
- 241000222393 Phanerochaete chrysosporium Species 0.000 description 1
- YNPNZTXNASCQKK-UHFFFAOYSA-N Phenanthrene Natural products C1=CC=C2C3=CC=CC=C3C=CC2=C1 YNPNZTXNASCQKK-UHFFFAOYSA-N 0.000 description 1
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical group C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 1
- 101150108015 STR6 gene Proteins 0.000 description 1
- 101100386054 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) CYS3 gene Proteins 0.000 description 1
- 239000007983 Tris buffer Substances 0.000 description 1
- 229920002522 Wood fibre Polymers 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000001299 aldehydes Chemical class 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- DLGYNVMUCSTYDQ-UHFFFAOYSA-N azane;pyridine Chemical compound N.C1=CC=NC=C1 DLGYNVMUCSTYDQ-UHFFFAOYSA-N 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 239000000872 buffer Substances 0.000 description 1
- 150000007942 carboxylates Chemical class 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000008139 complexing agent Substances 0.000 description 1
- 150000004696 coordination complex Chemical class 0.000 description 1
- GOYYUYNOGNSLTE-UHFFFAOYSA-N copper;2-azanidylethylazanide Chemical compound [Cu+2].[NH-]CC[NH-].[NH-]CC[NH-] GOYYUYNOGNSLTE-UHFFFAOYSA-N 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229960002069 diamorphine Drugs 0.000 description 1
- 150000001991 dicarboxylic acids Chemical class 0.000 description 1
- 238000004851 dishwashing Methods 0.000 description 1
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 description 1
- 229910000397 disodium phosphate Inorganic materials 0.000 description 1
- 235000019800 disodium phosphate Nutrition 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 238000007336 electrophilic substitution reaction Methods 0.000 description 1
- 239000003480 eluent Substances 0.000 description 1
- 238000006735 epoxidation reaction Methods 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000007306 functionalization reaction Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- RWSXRVCMGQZWBV-WDSKDSINSA-N glutathione Chemical compound OC(=O)[C@@H](N)CCC(=O)N[C@@H](CS)C(=O)NCC(O)=O RWSXRVCMGQZWBV-WDSKDSINSA-N 0.000 description 1
- 125000005842 heteroatom Chemical group 0.000 description 1
- 150000003840 hydrochlorides Chemical class 0.000 description 1
- 239000003295 industrial effluent Substances 0.000 description 1
- JYJVVHFRSFVEJM-UHFFFAOYSA-N iodosobenzene Chemical compound O=IC1=CC=CC=C1 JYJVVHFRSFVEJM-UHFFFAOYSA-N 0.000 description 1
- 108010062085 ligninase Proteins 0.000 description 1
- 159000000003 magnesium salts Chemical class 0.000 description 1
- 150000002696 manganese Chemical class 0.000 description 1
- 239000011565 manganese chloride Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- KVKFRMCSXWQSNT-UHFFFAOYSA-N n,n'-dimethylethane-1,2-diamine Chemical compound CNCCNC KVKFRMCSXWQSNT-UHFFFAOYSA-N 0.000 description 1
- YKAVSRCPSRSQRR-UHFFFAOYSA-N n,n-bis[(6-methylpyridin-2-yl)methyl]-1-pyridin-2-ylmethanamine Chemical compound CC1=CC=CC(CN(CC=2N=CC=CC=2)CC=2N=C(C)C=CC=2)=N1 YKAVSRCPSRSQRR-UHFFFAOYSA-N 0.000 description 1
- FFIMOEOESOMAGV-UHFFFAOYSA-N n-[(6-methylpyridin-2-yl)methyl]-2-pyridin-2-yl-n-(pyridin-2-ylmethyl)ethanamine Chemical compound CC1=CC=CC(CN(CCC=2N=CC=CC=2)CC=2N=CC=CC=2)=N1 FFIMOEOESOMAGV-UHFFFAOYSA-N 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 239000012074 organic phase Substances 0.000 description 1
- 150000004965 peroxy acids Chemical class 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 150000003222 pyridines Chemical class 0.000 description 1
- 125000004076 pyridyl group Chemical group 0.000 description 1
- 125000000168 pyrrolyl group Chemical group 0.000 description 1
- 150000005839 radical cations Chemical class 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- CSMWJXBSXGUPGY-UHFFFAOYSA-L sodium dithionate Chemical compound [Na+].[Na+].[O-]S(=O)(=O)S([O-])(=O)=O CSMWJXBSXGUPGY-UHFFFAOYSA-L 0.000 description 1
- 229940075931 sodium dithionate Drugs 0.000 description 1
- 229960001922 sodium perborate Drugs 0.000 description 1
- YKLJGMBLPUQQOI-UHFFFAOYSA-M sodium;oxidooxy(oxo)borane Chemical compound [Na+].[O-]OB=O YKLJGMBLPUQQOI-UHFFFAOYSA-M 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 101150035983 str1 gene Proteins 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000001384 succinic acid Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000010875 treated wood Substances 0.000 description 1
- 238000004832 voltammetry Methods 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
- 238000002424 x-ray crystallography Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/10—Bleaching ; Apparatus therefor
- D21C9/1078—Bleaching ; Apparatus therefor with Mn-containing compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
- B01J31/18—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes containing nitrogen, phosphorus, arsenic or antimony as complexing atoms, e.g. in pyridine ligands, or in resonance therewith, e.g. in isocyanide ligands C=N-R or as complexed central atoms
- B01J31/1805—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes containing nitrogen, phosphorus, arsenic or antimony as complexing atoms, e.g. in pyridine ligands, or in resonance therewith, e.g. in isocyanide ligands C=N-R or as complexed central atoms the ligands containing nitrogen
- B01J31/181—Cyclic ligands, including e.g. non-condensed polycyclic ligands, comprising at least one complexing nitrogen atom as ring member, e.g. pyridine
- B01J31/1815—Cyclic ligands, including e.g. non-condensed polycyclic ligands, comprising at least one complexing nitrogen atom as ring member, e.g. pyridine with more than one complexing nitrogen atom, e.g. bipyridyl, 2-aminopyridine
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/10—Bleaching ; Apparatus therefor
- D21C9/1026—Other features in bleaching processes
- D21C9/1036—Use of compounds accelerating or improving the efficiency of the processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
- B01J2531/70—Complexes comprising metals of Group VII (VIIB) as the central metal
- B01J2531/72—Manganese
Definitions
- the present invention relates to a process for the delignification and bleaching of a lignocellulose material by an aqueous solution of an oxidizing agent and of an oxidation-reduction catalyst.
- the invention therefore relates to the technical field of wood and of paper pulp and also to that of natural or synthetic oxidation-reduction catalysts.
- basidiomycetes known under the name of "Phanerochaete chryosporium" and leading to white rot of wood, was particularly studied as regards the biochemical mechanisms which are involved in delignification.
- Ligninases capture an electron from the aromatic rings of lignin and thus form radical cation species which progress non-enzymatically and which lead to depolymerization of lignin.
- Manganese peroxidases oxidize Mn 2+ cations to Mn 3+ cations.
- the Mn 3+ cations diffuse into the structures of wood and capture an electron to restore Mn 2+ .
- the above writers treated wood shavings or paper pulp with a number of natural or synthetic iron porphyrins in the presence of an oxidizing agent chosen from hydrogen peroxide or tert-butyl hydroperoxide (TBH), in an aqueous medium.
- an oxidizing agent chosen from hydrogen peroxide or tert-butyl hydroperoxide (TBH), in an aqueous medium.
- this porphyrin comprises 16 chlorine atoms substituting the phenyl and pyrrole rings and 4 sulphonato groups and that its synthesis is very expensive. Replacement of iron by manganese in this porphyrin structure does not substantially change the results.
- the 2,2'-bipyridine (bpy) complex of formula [(bpy) 2 MnO] 2 3+ and its 1,10-phenanthroline (phen) analogue are known. These complexes have been isolated in the form of stable solids in the Mn(III)/Mn(IV) oxidation state and have been studied in solution in their Mn(IV)/Mn(IV) complete oxidation state.
- the phen complex has been isolated as a solid in the Mn(IV)/Mn(IV) state and its structure characterized by M. Stebler et al., Inorg. Chem., 25, 4743 (1986).
- TPA is a tetradentate ligand consisting of tris(pyridyl-2-methyl)amine.
- the complex (I) is obtained by mixing TPA and MnSO 4 ⁇ H 2 O in water and then adding hydrogen peroxide.
- the salt [(TpA)MnO] 2 ⁇ (S 2 O 6 ) 3/2 ⁇ 7H 2 O crystallizes and its structure is determined by X-ray crystallography.
- Patent Application EP 0,458,398 (Unilever NV and plc) relates to a bleaching medium comprising a peroxy bleaching agent and a manganese coordination complex (or a precursor of the latter) for use in washing and bleaching substrates, especially for textile whitening or washing dishes.
- the latter coordination complex has the general formula (A):
- Mn manganese in the IV oxidation state
- n and m independently have the value of integers from 2 to 8,
- X can represent a coordinating or bridging group such as H 2 O, OH - , O 2 2- , HO 2 - , SH - , S 2- , -SO-, NR 2 - , RCOO - , NR 3 , Cl - , N 3 - , SCN - or N 3- , or a combination thereof, with R representing H, alkyl or aryl (optionally substituted),
- Y is a counterion whose type depends on the charge z of the complex; if z is positive, then Y represents an anion such as Cl - , Br - , I - , NO 3 - , ClO 4 - , NCS - , PF 6 - , RSO 3 - , RSO 4 - , CF 3 SO 3 - , BPh 4 - 0 or OAc - ; if z is negative, then Y is a cation of an alkali metal or alkaline-earth metal or alternatively an (alkyl)ammonium cation,
- z is a negative or positive integer
- L is a ligand which is an organic molecule containing a certain number of heteroatoms (N, P, O and S), some of which are coordinated to the manganese atoms.
- a preferred class of ligands L which correspond to the formula (C) are tridentate ligands which coordinate each manganese(IV) centre with 3 nitrogen N atoms.
- Bis(pyrid-2-ylmethyl)amine appears among 19 of the latter (containing 3 nitrogen atoms).
- the peroxy bleaching agents used comprise hydrogen peroxide (H 2 O 2 ), compounds which release or generate H 2 O 2 , especially sodium perborate, and peroxy acids and their salts.
- Oxygen for example, has little selectivity and also severely degrades the cellulose in NaOH medium and, to a lesser degree, in the presence of magnesium salts.
- Chlorine is a relatively selective delignifying agent. Under the acidic conditions used, it causes oxidation but also electrophilic substitution of the aromatic rings of the lignin, producing dicarboxylic acids and chlorinated fragments of the lignin. The latter represent a potential danger to the environment.
- Hydrogen peroxide is used essentially in basic medium. This basic medium leads to a certain depolymerization of the cellulose.
- the aim of the present invention is the development of a new means for delignifying and bleaching lignocellulose material in suspension in an aqueous medium.
- Another, more specific, aim is to avoid the nucleophilicity of chlorine in bleaching paper pulp in order to eliminate potential environmental problems related to TOX ("total organically bound halogens").
- a third aim is to use oxygen-containing oxidizing agents such as ozone, hydrogen peroxide or their mixtures in a delignification and a bleaching in acidic or neutral aqueous medium, by adjusting the oxidation potential of this medium to a chosen value.
- oxygen-containing oxidizing agents such as ozone, hydrogen peroxide or their mixtures in a delignification and a bleaching in acidic or neutral aqueous medium
- the present invention is a process for the delignification and bleaching of a lignocellulose material in suspension in an aqueous medium containing an oxidizing agent and an oxidation-reduction catalyst chosen from a family of ligand-containing manganese complexes, some of which have already been described, especially by D. J. Hodgson et al.
- the present invention is a process for the delignification and bleaching of a lignocellulose material in which an aqueous solution of a redox catalyst and of an oxidizing agent is reacted with the said material, characterized in that the said catalyst contains an organometallic cation of general formula (VII):
- Mn represents manganese in a Ill or IV oxidation state, it being possible for the two Mn atoms of this cation to form an pair in the III-III or III-IV or IV-IV oxidation state,
- n has the value 2, 3 or 4,
- L represents a ligand of general formula (VIII): ##STR3## in which either R 1 represents the radical: ##STR4## R 2 then representing the radical: ##STR5## R 3 , R' 3 and R" 3 each representing, independently of one another, a group chosen from hydrogen, C 1 to C 4 lower alkyl, C 1 to C 4 lower alkoxy or halogen,
- R 1 represents the radical: ##STR6## R 2 and R' 2 then being identical and representing a group chosen from hydrogen or C 1 to C 4 lower alkyl,
- R 3 representing a group chosen from hydrogen, C 1 to C 4 lower alkyl, C 1 to C 4 lower alkoxy or halogen.
- the counteranion is not represented but it can have, for example, the same meaning as that of Y of the above formulae (A) or (C).
- This process has the advantage that the organometallic cation (VII) is very stable with respect to the oxidizing power of the medium and that the solution containing it can, after reaction, be recovered and reacted again with a new batch of lignocellulose material to which the oxidizing agent has been added.
- the pH of the aqueous solution is advantageously less than 7 and preferably between 2 and 5.
- the latter in order to remove, by extraction, the oxidation products of the lignocellulose material, the latter, after the oxidation reaction ((VII)+oxidizing agent), is treated with a basic aqueous solution.
- This basic treatment can be preceded by a washing with water and/or a pressing of the lignocellulose material.
- the oxidizing agent is preferably chosen from ozone, hydrogen peroxide, an alkyl hydroperoxide, hypochlorous acid, chlorine, chlorine dioxide or their mixtures.
- the criterion in selecting these oxidizing agents consists in determining their ability to give the cation of general formula (VII), the two manganese atoms of which are in the III-III or III-IV or IV-IV oxidation states.
- III-III state is not always isolated for all the complexes.
- L is TPA
- the oxidation state obtained in the synthesis of this complex where hydrogen peroxide is involved is III-IV.
- L is (6-methyl-2-pyridylmethyl)(2-(2-pyridyl)ethyl) (2-pyridylmethyl)amine (L 3 )
- the cation (VII) obtained by the action of hydrogen peroxide is III-IV.
- Chemical oxidation of this complex with NaOCl placed in acidic medium gives the IV-IV oxidation state.
- the preferred combinations of the redox cations of general formula (VII) with the oxidizing agents are those which lead to an III-IV and/or IV/IV oxidation state.
- the oxidizing agent is preferably added little by little to the solution of the redox catalyst (VII) in the presence of the pulp, so that there is no excess of oxidizing agent which can react directly with the lignocellulose material.
- the oxidation potential is then, as it were, buffered to that of the redox catalyst (VII) in its III-IV state or, according to the situation, its IV-IV state, it being known that the oxidation potential of the oxidizing agent is, in principle, always greater than that of the redox catalyst.
- the lignocellulose material reacted is advantageously wood fragments or paper pulp containing lignin.
- each group R 3 , R' 3 and R" 3 is in the para position with respect to the doublet of the pyridine nitrogen.
- each group R 3 , R' 3 and R" 3 is chosen from lower alkyl or lower alkoxy.
- the ratio by weight of the redox catalyst to the lignocellulose material is between 0.1 and 10%.
- the temperature of the said aqueous solution of oxidizing agent and of catalyst is between 80° C. and 100° C.
- the catalyst/oxidizing agent molar ratio is preferably between 0.1 and 4%.
- the ratio by weight of the lignocellulose material to the oxidizing agent is between 2 and 100.
- the ligands of general formula (VIII) are generally synthesized from the pyridine compounds of the general formula (IX): ##STR7## in which: R represents a group chosen from H, lower alkyl, lower alkoxy or halogen,
- R is in the 3-, 4-, 5- or 6-position on the pyridine ring and preferably in the 4-position
- X represents a group chosen from -CH 3 , -CH 2 OH, -CH 2 Cl, -CHO, -CH ⁇ N-OH, -COCH 3 , -CO 2 H, -CO 2 R' with R' representing a lower alkyl, -CN or -CH 2 NH 2 .
- the various groups X above can be obtained by known reactions, from one to another, by functionalizations, reductions or oxidations.
- the catalysts (VII) in which n has the value 2 or 3 are obtained by mixing a salt containing the Mn 2+ cation, especially contributed by MnSO 4 or MnCl 2 , with a ligand L (VIII) in water in the presence of hydrogen peroxide, according to the processes described by D. J. Hodgson (see above).
- the complexes (VII) in which n has the value 4 are obtained by oxidizing the corresponding complexes in which n has the value 2 or 3 with more powerful oxidizing agents than hydrogen peroxide, for example hypochlorous acid (HClO), chlorine dioxide (ClO 2 ), chlorine or ozone.
- oxidizing agents for example hypochlorous acid (HClO), chlorine dioxide (ClO 2 ), chlorine or ozone.
- the qualities of the paper pulp kappa number (K) of the pulp and degree of polymerization of the cellulose (DP), are determined as specified below.
- the lignin is oxidized with KMnO 4 in weakly acidic medium.
- the kappa number is defined (according to Standard NF/150-302) as the number of millilitres of a 0.02M KMnO 4 solution necessary to oxidize completely one gram (dry weight) of paper pulp.
- One kappa point therefore represents: 10 -3 ⁇ (0.02 ⁇ 5) ⁇ e - , i.e. 0.1 electronic milliequivalent/g of pulp.
- the method for measuring the degree of polymerization consists in measuring the specific viscosity of a pulp solution in cupriethylene diamine and in deducing the mean degree of polymerization (DP) therefrom, according to French Standard NF T 12 005 (March 1953).
- the pulps are washed beforehand with water (90° C., 20 min) and dried in an oven (50° C., under vacuum) and then form the subject of a first determination of the kappa number and of the DP.
- the two pulps used then have the following characteristics collated in Table 3.
- N,N'-Dimethylethylenediamine is commercially available.
- the other diamines are obtained according to the publication Helvetica Chim. Acta, 57, 1974, p. 1036.
- the die/nine (10 mmol) is dissolved in water (5 ml) and then picolyl chloride (20 mmol), which may or may not be substituted, is added. 5N sodium hydroxide solution is then added so as to maintain the pH from 9 to 9.5. If the reaction medium contains too much insoluble compounds, ethanol (5 ml) is added.
- basification is carried out to a pH greater than 12 and extraction is carried out either with ether or with dichloromethane.
- the organic phase is either distilled or chromatographed on basic alumina, the eluent being dichloromethane.
- the diamines can be converted to their hydrochlorides by bubbling HCl gas into their ether solutions.
- Hydrogen peroxide in solution in water is then added in a single step at the beginning of the reaction or else progressively over time, with stirring of the heterogeneous medium,
- the tests are carried out at different temperatures (60° C., 80° C., 90° C. and 98° C.) for a predetermined time.
- the preceding oxidation reaction is stopped by washing the pulp with 0.1M pyrophosphate buffer with a pH of 6.0.
- the pulp is placed for 1 hour in a 0.25M sodium hydroxide solution at 60° C.
- the aim of this operation is to extract, from the pulp, the fragmented compounds, phenols and carboxylates, which are soluble in the hot alkaline solution.
- the pulp thus treated is copiously washed with water in order to remove all traces of base, filtered off and dried in an oven (50° C.) under vacuum.
- a new determination of the kappa number and also optionally of the DP is then carried out.
- Table 4 collates the H 2 O 2 contents and the kappa numbers obtained with or without manganese, at a temperature of 90° C., for a duration of oxidation of 3 hours and at a pH of 3.5.
- the reaction medium After a first treatment, the reaction medium is separated from the paper pulp by filtration. The kappa number is determined on the treated pulp. The reaction medium is brought into contact with a new batch of pulp. A new hydrogen peroxide solution is introduced continuously. It is estimated that from 40 to 50% of the catalyst is recovered after each cycle.
- An unbleached hardwood pulp which has a kappa number equal to 13 is subjected to the same stages as Example 1 but with ligands of the Bispicen type.
- Table 13 below shows the role of the substituents on the kappa number obtained.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paper (AREA)
- Detergent Compositions (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
- Catalysts (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9207577 | 1992-06-22 | ||
FR9207577A FR2692499B1 (fr) | 1992-06-22 | 1992-06-22 | Procédé de délignification et de blanchiment d'une matière lignocellulosique. |
PCT/FR1993/000613 WO1994000234A1 (fr) | 1992-06-22 | 1993-06-21 | Procede de delignification et de blanchiment d'une matiere lignocellulosique |
Publications (1)
Publication Number | Publication Date |
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US5630906A true US5630906A (en) | 1997-05-20 |
Family
ID=9431007
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/356,283 Expired - Fee Related US5630906A (en) | 1992-06-22 | 1993-06-21 | Process for the delignifcation and bleaching of a lignocellulose material |
Country Status (12)
Country | Link |
---|---|
US (1) | US5630906A (de) |
EP (1) | EP0647158B1 (de) |
JP (1) | JPH08500856A (de) |
AT (1) | ATE157024T1 (de) |
AU (1) | AU671284B2 (de) |
BR (1) | BR9306591A (de) |
CA (1) | CA2138797A1 (de) |
DE (1) | DE69313284D1 (de) |
FI (1) | FI945990A (de) |
FR (1) | FR2692499B1 (de) |
NZ (1) | NZ253184A (de) |
WO (1) | WO1994000234A1 (de) |
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US6136041A (en) * | 1996-04-13 | 2000-10-24 | Jaschinski; Thomas | Method for bleaching lignocellulosic fibers |
US6140294A (en) * | 1998-11-10 | 2000-10-31 | Unilever Home & Personal Care Usa, Division Of Conopco, Inc. | Bleach and oxidation catalyst |
US6165963A (en) * | 1998-11-10 | 2000-12-26 | Unilever Home & Personal Care Usa, Division Of Conopco, Inc. | Detergent bleaching composition comprising pentadentate ligand derivatives |
EP1101860A1 (de) * | 1999-11-19 | 2001-05-23 | Praxair Technology, Inc. | Verfahren zum Bleichen von Pulpe mittels aktivem Ozon |
KR100555040B1 (ko) * | 1998-12-29 | 2006-05-16 | 주식회사 엘지생활건강 | 트리스(2-피리딜메틸)아민 망간 착화합물과 이를 함유한 표백제및 표백세제 조성물 |
US20100159521A1 (en) * | 2008-12-19 | 2010-06-24 | E. I. Du Pont De Nemours And Company | Ozone treatment of biomass to enhance enzymatic saccharification |
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DE19620241A1 (de) * | 1996-05-20 | 1997-11-27 | Patt R Prof Dr | Verfahren zum Delignifizieren von Zellstoffen und Verwendung eines Katalysators |
WO1997048787A1 (en) * | 1996-06-19 | 1997-12-24 | Unilever N.V. | Bleach activation |
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- 1993-06-21 WO PCT/FR1993/000613 patent/WO1994000234A1/fr active IP Right Grant
- 1993-06-21 JP JP6502092A patent/JPH08500856A/ja active Pending
- 1993-06-21 EP EP93913166A patent/EP0647158B1/de not_active Expired - Lifetime
- 1993-06-21 AU AU43333/93A patent/AU671284B2/en not_active Ceased
- 1993-06-21 DE DE69313284T patent/DE69313284D1/de not_active Expired - Lifetime
- 1993-06-21 BR BR9306591A patent/BR9306591A/pt not_active Application Discontinuation
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US6140294A (en) * | 1998-11-10 | 2000-10-31 | Unilever Home & Personal Care Usa, Division Of Conopco, Inc. | Bleach and oxidation catalyst |
US6165963A (en) * | 1998-11-10 | 2000-12-26 | Unilever Home & Personal Care Usa, Division Of Conopco, Inc. | Detergent bleaching composition comprising pentadentate ligand derivatives |
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Also Published As
Publication number | Publication date |
---|---|
BR9306591A (pt) | 1998-12-08 |
JPH08500856A (ja) | 1996-01-30 |
ATE157024T1 (de) | 1997-09-15 |
CA2138797A1 (fr) | 1994-01-06 |
AU4333393A (en) | 1994-01-24 |
NZ253184A (en) | 1995-09-26 |
WO1994000234A1 (fr) | 1994-01-06 |
EP0647158A1 (de) | 1995-04-12 |
AU671284B2 (en) | 1996-08-22 |
FR2692499B1 (fr) | 1994-08-26 |
EP0647158B1 (de) | 1997-08-20 |
FR2692499A1 (fr) | 1993-12-24 |
DE69313284D1 (de) | 1997-09-25 |
FI945990A (fi) | 1995-02-21 |
FI945990A0 (fi) | 1994-12-21 |
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